Re: issue 19 -- same addresses for both directions?

I wrote earlier tha the decision on issue 20 (who decides)
also has a big impact on issue 19. If we had decided in 20
that the decisions  are independent, then it might in fact
have been very hard to  ensure that the two directions
use the same addresses. As a result, allowing different
addresses would make  more sense in this scenario.

But we ended up with "initiator decides". Therefore the
deciding entity knows enough about the situation to be
able to use the same address pairs in both directions.

Of course, this does not necessarily have to be done.
We could develop a protocol that provides independent
addresses, yet would be controlled by the initiator.
(Probably with some cost in terms of complexity.
And I'm not quite sure how to deal with NATs and
keepalives in that kind of a scenario.)

How do you folks feel about this? Please post your
comments by Friday, June 3rd.

--Jari